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<head>
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    <title>数组练习</title>
</head>
<link rel="stylesheet" href="./css/index.css">
<script src="./js/index.js"></script>

<body>
    <span>January(1),
        February(2),
        March(3),
        April(4),
        May(5),
        June(6),
        July(7),
        Aguest(8),
        September(9),
        October(10),
        November(11),
        December(12)</span>
    <input type="button" value="删除January(1)">
    <input type="button" value="删除December(12)">
    <span>0,1,2,3,4,5,6,7,8,9</span>
    <input type="button" value="复制">
    <input type="button" value="还原">
    <span>red,green,blue,white,yellow,black,brown</span>
    <input type="button" value="还原">
    <input type="button" value="删除前三项">
    <input type="button" value="删除第二至第三项">
    <input type="button" value="在第二项后插入(orange,purple)">
    <input type="button" value="替换第二项和第三项">
</body>

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